A set includes all componets to seal the valve cover inclu. upper plug tube seals,ect.
To seal the lower part of the plug tube it has to be removed and sealed, best left to a mechanic,
or a savvy car person with proper tools! If the upper seals were not installed,or properly installed
oil will pond in plug tubes! This is the most likely scenario. However a lower seal will have the same results!
Usually the top seals fix this problem IF installed correctly.